寄存器编写一个数据发送函数！！！串口2配置已经配好了

hongyu12345 · 发表于 2021-5-26 14:27:48

怎么使用stm32f407vgy6实现这个串口2的数据输出，控制一个语音模块

#include "usart2.h"

#include "USART2.h"

void USART2_Init(u32 bound)
{
float USARTDIV=0;
u16 DIV_Mantissa=0;  //Õûêy2¿·Ö
u8 DIV_Fraction=0;  //D¡êy2¿·Ö
//1)GPIOÅäÖÃ
RCC->AHB1ENR  |=1<<0;          //GPIOA ê±Öóê1Äü
GPIOA->MODER  &=~(0xF<<(2*2)); //Ä￡ê½ÅäÖ&#195

A2,PA3
GPIOA->MODER  |=0xA<<(2*2);    //¸′óÃÄ￡ê½
GPIOA->AFR[0] &=~(0xFF<<8);    //¸′óÃ1|ÄüÑ¡Ôñ
GPIOA->AFR[0] |=0x77<<8;

RCC->APB1ENR  |=1<<17;//USART2ê±Öóê1Äü
//2)USARTÏà1Ø2ÎêyÅäÖÃ￡¨￡¬1y2éÑùÄ￡ê½￡¬×Ö3¤￡¬ÆæÅ¼D￡Ñé￡¬í￡Ö1Î»￡©
USART2->CR1 &=~(1<<15);       //16±¶1y2éÑùÄ￡ê½
USART2->CR1 &=~(1<<12);       //1 Æeê¼Î»￡¬ 8 êy¾YÎ»￡¬ n í￡Ö1Î»

//3)′®¿ú2¨ìØÂê¼ÆËãoíD′èë

USARTDIV    =42*1000000/( 16.0*bound  ) ;  //3ËòÔ16.0￡¬μÃμ½¸¡μãDíêy¾Y
DIV_Mantissa = USARTDIV;                   //μÃμ½Õûêy2¿·Ö
DIV_Fraction = (USARTDIV -DIV_Mantissa)*16;  //μÃμ½D¡êy2¿·Ö
USART2->BRR  = (DIV_Mantissa<<4) | DIV_Fraction; //D′èë2¨ìØÂê¼Ä′æÆ÷

//4)Ïà1Øê1Äü
USART2->CR1  |=1<<3;             //·￠ËíÆ÷ê1Äü
USART2->CR1  |=1<<2;             //½óêÕÆ÷ê1Äü
USART2->CR1  |=1<<13;             //′®¿úÄ￡¿éê1Äü
}

正点原子 · 发表于 2021-5-27 01:54:06

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寄存器编写一个数据发送函数！！！串口2配置已经 配好了

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寄存器编写一个数据发送函数！！！串口2配置已经配好了